Motor-controller.



T{EJBARNUM. 11101011601111101151 'AYPPLlcATloN 111120111111. 12. 1915. yI j l Patented Apr. 22,1919.4

2 SHEETS-s115511.

T. E.-B.ARNUM.

' MOTOR CONTROLLER. APBLICATION F1LED.JAN.12.19|5.

Patented Apr.` 22, 1919.

2 SHEETS-SHEET 2.

UNITED sTATEs PATENT oEEroE.

THOMAS E. BARNUM, F MILWAUKEE, WISCONSIN, ASSIGNOB T0 THE CUTLER-HAMMEB',VMFG. CO., 0F MILWAUKEE, WISCONSIN, A CORPORATION OF WISCONSIN..

MOTOR-CONTROLLER.

Specification of Letters Patent. Y Patented Api'. 22, 1919.

Application med January 12, 1.915. Serial No. 1,758.

To all whom t may concern.'

Be it known that 1,. THOMAS E. BARNUM,

a citizen of the United States,residing atY This invention relates tocontrollers .forl

electric motors and more particularly to self starters therefor Oneobject of the invention is to provide a self starter for elevator,printing press and other service where quick response of the starter isdesired.

Other objects and advantages of the invention will hereinafter appear.

The 'accompanying drawings illustrate one embodiment of the inventionwhich will now `be described.

In the drawings,

Figure 1 is a front troller;

Fig. 2 is an end elevation looking from the left hand side of Fig.` 1;l

Fig. 3 is a sectional view on line 3-3, Fig. 1 and Fig. 4 is adiagrammatic view of one circuit arrangement for the controller.

As illustrated in Figs. 1 to 3, the controller includes anelectro-responsive main switch 1, a multi-switch accelerating device 2tending to move to running position, a solenoid 3 forrestoring saidaccelerating device to starting position, anda mechanical latchingdevice 4 (Fig. 2) for holding the accelerating device in startingposition subject -to release by said main switch. Also, the controllerincludes interconnections between the two electro-responsive deviceswhereby the accelerating device is restored to starting positionwhenever the main switch is opened and whereby the main switch isinsured against response except when the accelerating device is instarting position. It will thus be observed that the controller may beoperated to start and accelerate the controlled moter immediately uponclosure ofthe energizing circuit of the main switch and that the motoris insured due protection upon .closure of the4 main switch. Hence-theadvantage of the controller in elevator and printing press service,

elevation of the con-- where quick starting is desired, will be read-11y apparent.

l The I nain switch 1 as illustrated is of conventlonal form and brieflydescribed inl cludes two contact arms 5 and 6 mounted upon but insulatedfrom the armature 7 of an electromagnet 8 supported in a suitable frame9- fixed to an insulating panel 10.- As illustrated in Fig. 3 thearmature 7 is fulcrumed on a pin l1 and the arms 5 and 6 have pivotedcontact members 12 coperating with 'fixed contacts 13 inclosed insuitable blowout devices 14. Also, referring to Fig. 1, the armature 7has two downward extensions 15 carrying a cross-bar 16 coperating withtwo pairs of yielding contact fingers 17 and 18 mounted on the panel 10,the bar 16 bein suitably insulated from said armature. T e arrangementis such that when the main switch 1s in open position bar 16 bridgescontact fingers 17 whereas when said switch closes, bar 16 leavesfingers 17 and rbrid es fingers 18. The left hand extension 15 othe'armature also carries a pin .19to trip the latch ofthe acceleratingdevice, as hereinafter set forth.

The accelerating device includes a plurality of contact fingers 20 ofconventional form coperating with contacts 21 on the panel 10.` Theseveral contact fingers are mounted upon a common rotatable shafty orbar 22 having end bearings 23 and 24 and each finger hasatrunnionbearing 25 on said shaft. Also, each contact finger has pro- ]ectingtherethrough a pin 26 fixed at one end to a plate 27 on the panell() andcarrying at its outer end a coil sprin 28 bearing against said finger topress t e same inywardly. The springs 28 thus tend to move the contactfingers vinto engagement with the contacts 421, thereby tending to movethe device to running position, as above set forth. The shaft 22, on theother hand, has a series of .cams 29 (Fig. 3) which uponcounter-clockwise rotation of said shaft progressively liftv the fingersout of engagement with the contacts 21 and upon clockwise -rotationrestrain the Vcontact fingers for progressive en .gement with thecontacts 21. Counter-c ockwise rotation' of the shaft 22 is effected bythe solenoid 3 which is mounted in a frame 30 fixedto the panel andprovided with a plunger 31 connectedv to the extremity of an arm 33fixed to and prolecting outwardly from the shaft 22.

The clockwise rotation of the shaft is effected jointly by the tensionof the springs 28 and a weight'34 on the arm 33 against the action of adash-pot 35 mounted on the solenoid frame and connected to the extremityofthe arm' 33 (Fig. 2'). Asfwill be understood, the dash-pot is providedto retard the movement of the acceleratin device for insuring gradualacceleration. lso, the accelerating device is provided with anadjustable stop to vary its limit of downtherein to receive the pin 39.As shown,-

the arm 33 and stop lever are in alignment whereby the acceleratingdevice is permitted a maximum downward movement, whereas the downwardmovement ma be restricted by lowering the free end o the stopgleverrelative to the arm 33 and locking said lever and arm together in thedesired relation according to the degree of restriction desired.

The latching means for the acceleratin device includes a pivoted hook 41(Fig. 2

suspended from a suitable bracket 42 and biased by a spring 43 to engagea lug 44 on the arm 33 in starting position of the accelerating device.This provides for automatic latching of the accelerating device instarting position and release of the accelerating device is eiiected bythe pin 19 on the main switch acting upon an extension 45 of the hook41. As will be apparent from Fig. 2

the hook moves in a counter-clockwise direction to latch theaccelerating device, whereas the pin 19 which moves outwardly uponclosure of the main switch, acts upon the extension 45 to move thehookin a clockwise direction to release the accelerating device. Also, aswill be apparent from Fig. 2, when the accelerating device is releasedthe lug 44 engages the hook 41 to prevent return or counter-clockwisemovement of said hook until return of theaccelerating device .tostarting position, for a purpose hereinafter set forth. l

The aforesaid interconnections of the two electro-responsive devices areeiiected by the above-described contacts associated with the main switchand by two additionalsets of contact ingers 46 and 47. The contacts 46are of the same form as contacts 17 and 18 and are adapted to be bridgedby a pin 48 (Fig. 1) carried by an extension 49 of the latching hook 44(Fig. 2). The arrangement is such that fingers 46 are bridged by the pin48 upon tripping of the latch and in consequence upon release of theaccelerating device, whereas they are disengaged by said pm uponmovement of the latching hook to latching position. As before stated,the hook 41 when tripped iS held against return or counter-clockwisemovement until return of the accelerating device nto starting positionandthe pin 48 is thereby held independently of the main switch, in briding engagementwith the contacts 46 pending full return of theaccelerating device to starting position. The contact fingers 47 aresimilar to fingers 46 and are adapted'to be bridged by a pm 50 (Fig. 1)carried by a downwardly extending lug 51 on the arm 33 of theaccelerating device (Fig. 2). The arrangement is such that in downposition of said arm the pin 50 is disengaged from fingers 47 whereasupon upward movement of said arm said pin is moved to bridge saidfingers.' As will be hereinafter more fully described the contacts 46-48coperate with contacts 16-17 to energize solenoid 3 when main switch lis opened and the accelerating device is in running position. On theother hand, contacts 46-48 serve to interrupt the circuit of solenoid 3upon return vof the accelerating device to starting position, whilecontacts 16-17 serve to interrupt the energizing circuit of solenoid 3when the main switch closes. included in the energizing circuit of themain switch and open said circuit upon movement of the acceleratingdevice from starting position thereby insuring against energization ofthe main switch except in starting position of the accelerating device,while contacts 16-18 complete a maintaining circuit for .the main switchafter. response thereof. i y Referring now to Fig. 4 the controller isshown schematically and as governing an alternating current motor M. Themain switch l controls the continuity of the primary cir-cuit of themotor while the accelerating device controls resistances R, R and R2 inthe secondary circuit of the motor, said device serving to exclude saidresistances in steps. For purposes of illustration the motor M has beenshown as of a three-phase type, being supplied with current from lines52-53 and 54 while the winding oftheI main switch and the solenoid 3 areconnected across one phase of the supply circuit, the main switch beinggoverned by a suitable control switch 55. With the devices positioned asillustrated the motor is disconnected from circuit and the windings ofboth the main switch and accelerating device denergized.

Assuming now that switch 55 be closed, circuit will be established fromvline 52 through switch 55, by conducting 56 through Contacts 47-50 are=contacts 47-50, by conductor 57 through the winding of main switch 1, byconductor 58 to line 53. This energizes main switch 1 causing the sameto complete the primary circuitof the motor, which circuit is obviousand needs no description, and' also to trip the latch of theaccelerating device. The accelerating devicethen operates to acceleratethe motor by excluding the resistances R, R' and R2 'through circuitvariations which are so obvious as to. require noV description. Mainswitch 1 upon closing also completes a maintaining circuit for itselfextending from switch 55 by conductor, 59 through contacts v16-`-18, byconductor 60 to conductor 57., thereby paralleling the contacts 47-50associated with the accelerating device.

Assume now that the motor has been started and fully accelerated andthat itis desired to stop thesame. This is accomplished by openingswitch 55 to denergize the main switch 1. The main switch thereuponopens completing the circuit of solenoid 3 from line 52 by conductor 61through saidvsolenoid, by conductor 62 through contacts 46- 48, byconductor 63 through contacts 1'6-17,

by conductor 64 to line 53. 'Solenoidthere-V upon responds to restorethe accelerating device to starting position and upon Vfull returnmovement of the accelerating device the latching device thereof sets andin so doin disengages contact 48 from contact 46. his denergizesSolenoid 3 leaving the accelerating device restrained solely by themechanical latching means and subject to release for immediate operationupon reclosure of the main switch.

Should the main switch` open through failure of voltage the result wouldbe the same as that described invthat the accelerating. device wouldberestored to starting position upon restoration of voltage and the Y mainswitch would be insured against reclosing pending such-return movementof the accelerating device.

It will, of coui'se, be understood that thel invention may be embodiedin other forms falling within the scopeY ofthe appended claims.

What I claiin as new and desire to secure by Letters Patent is:

1.In a motor controller, in combinationf tioned device to release `saidaccelerating Veo' device upon operation of said power controllingdevice, and means to directly control said power controlling device forstarting Y .of the controlled motor.

2. In a motor controller, in combination,

'an electro-responsive power controlling device, an accelerating devicebiased to running position, a latching device for holding saidaccelerating device in starting position, means acting upon saidlatching device to release said accelerating device upon operation ofsaid power controlling device and 'electro-responsive means forreturning said accelerating device to starting position upon return ofsaid power controlling device to establishment of power connections forthe motor, electro-responsive means for restor` ing said acceleratingdevice to starting position upon operation of said power controlling'device to interrupt power connections and means associated with saidlatching device to denergize said electro-responsive .l

means upon restoration of said accelerating device to starting position.

4. In aV motor controller, in combination,

means controlling the continuity of' the` motor circuit, a separatelyoperable accelerating device biased to running position, means normallholding said device in starting position su ject to release by theformer' means when operated to close the motor circuit, and means forautomatically returning said device from running position tol startingposition upon opening of the motor circuit by the first mentioned means.

5. In a motor controller, in combination, power actuated meanscontrolling the continuity of the motor circuit, an accelerating devicebiased to' running position, means normally holding said device instarting position subject to release by the former means whenl operatedlto close the motor circuit,

means' for automatically returning said de` vice from running positionto starting position upon opening of the motor circuit by said formermeans and means Mfor rendering return of'said accelerating device tostarting position prerequisite to operation of the first mentioned meansto Yclose the motor circuit.

6. 'In a motor controller, in combination, a main switch controlling thecontinuity of the motor circuit an accelerating`device 'tending to moveArom starting position to running position and having electro-responsivemeans controlled by said switch to move the same to starting positionupon interru ltion of the motor'circuit and means controllbd by saidswitch for retaining said device in starting position subject to releaseupon operation of said first mentioned means lto close the` motorcircuit. l

7. In a motor controller, in combination, means controlling thecontinuity of the motor circuit, accelerating means tending to.' movefrom starting position to running position and having releasablemechanical means for retaining the same in starting position subject torelease by said former means and electro-responsive means controlled bysaid first mentioned means to return saidA accelerating means tostarting position upon interruption of the motor circuit andself-controlled to eect its own deenergization upon the aforesaidoperation of said accelerating means.

8. In a motor controller, in combination, means controlling thecontinuity of the motor circuit, accelerating means tending to move fromstarting position to running position, electroresponsive means controlleby said frstmentioned means to return said accelerating means tostarting position upon interruption of the motor circuit and havingassociated therewith means to eii'ect its denergization upon suchoperation, of said accelerating means, land other means to re.

tain said accelerating means in starting position subject to hautomaticrelease upon reclosure of the motor circuit.

9. In a motor controller, in combination, means controlling thecontinuity of the motor circuit, accelerating means -tending to movefrom starting position to running position, electro-responsive meansresponsive to return said accelerating means to starting position uponinterruption of the motor circuit by said first mentioned1 means subjectto release upon subsequent operation of said first mentioned meansv toreclose the motor circuit.

10. In a lmotor controller, in combination, means controlling thecontinuity of the motor circuit, accelerating means normally locked instarting position and subject to release by said first mentioned meansupon closingV the motor circuit, said accelerating means when soreleased automatically mov'- ing to running position, andelectrofresp'onsive means controlled by said first mentioned means toreturn said accelerating means to starting position upon interruption ofthe motor circuit.

l1. In a motor controller, in combination, means controlling thecontinuity of the motor circuit, accelerating means normally locked linstarting position and subject to release by said first mentioned meansupon closing the motor circuit, said accelerating means when so releasedautomatically moving to running position, and electro-responsive meanscontrolled by said first mentioned lmeans to return said acceleratingmeans t0 starting position upon interruption of they motor circuit, saidlast mentioned means having associated therewith means to deenergize thesame upon return of said accelerating means to starting position.

12. In a motor controller, in combination, electro-responsive meanscontrolling the continuity of the motor circuit, a control switchtherefor, accelerating means tending to stand in running position andhaving electro-responsive means for moving the same to starting positionyand interconnections between said means whereby the energization ofsaid accelerating means is eii'ected by said first mentioned means uponinterruption of the motor circuit and whereby return of saidaccelerating means establishes connections for energization of saidfirst starting position subject to release by said main switch,electro-responsive means for returning sald -acceleratlng means tostarting position, a switch in the energizing cir` cuit of said mainvswitch associated with said accelerating means to insure againstclosure in the energizing circuit of said second-mem.

tioned electro-responslve means operable automatically to interruptsaidcircuit upon return of, said accelerating means to starting position.

In witness whereof, I have hereunto subscribed my name in the presenceof two witnesses.

'rHoMAs n. BARNUM. t

Witnessesr TEKLA BAs'r, L. A, WATsoN.

